iFixit - Answers With Device "Samsung Galaxy A40"

Samsung Galaxy A40: Samsung A40 (UK) won't charge

Wed, 10 Dec 2025 15:26:24 -0700

Hi there, Firstly, the phone we have was not listed. My son has a samsung A40 (UK) after only having it for a few months the phone stopped charging. We bought a new cable and checked socket etc but still nothing. We contacted the provider who told us to take it to car phone warehouse. They said that it was a faulty charging port and that it wasn't covered under warranty. They also said that they will wipe the phone should we chose to have them repair it, as this was their standard procedure. My son had not been able to back his phone up as it had died at this point and didnt want them to wipe it. So, as I have repaired a fair few phones in the past, I bought the part (a small circuit board pba) and easily swapped them over, however, the phone was still not charging. I even bought a second one just in case the part was faulty, but it still won't charge. I cannot perform any software troubleshooting as the phone is dead. Any help would be greatly appreciated. Kindest regards Claire xx

⟐ Commented December 10, 2025 at 15:26 MST

Samsung Galaxy A40: Suddenly blankness and refusal to turn on

Mon, 08 Dec 2025 01:59:48 -0700

My Samsung Galaxy A40 have been experiencing suddenly blankness and sometimes,but for some months now it refuses to turn on and it makes a hissing sound when I charging but never turned on?

Please help

⟐ Edited by author December 08, 2025 at 1:59 MST

Samsung Galaxy A40: Why is the phone going off every after 2 minutes and factoreset

Thu, 04 Dec 2025 07:07:51 -0700

I factorested my phone in the settings but when it finished the screen blacking out after when switched on like two minutes how can fix it to normal the way it was before reseting it

Samsung Galaxy A40: Samsung A40 Sea Salt Water Damaged. -Photos and Video Included!-

Fri, 15 Aug 2025 14:03:17 -0700

Hello, I have a samsung a40 that fell in salt water at like December of 2023. I tried to fix it in mid 2024 but I got no signs of life. Today, which I have more tools than then, I tried to fix it again. I took off the shields off the chips and cleaned everything with 99 percent alcohol and an ultrasonic cleaner with distilled water. After replacing battery and charge port and sub-main cable, the phone draws 0.00 amps and a high pitched noise comes off the mainboard. No vibrating and no speaker, and no screen sign.I have a lot of important photos on there that I would like to save. Does anyone know if this phone is saveable?? And if it is, how should I proceed??Please answer it is very important!! Thank you.Here are some photos of the main board and a video of the high pitched sound when charging:

⟐ Commented August 15, 2025 at 14:03 MST

Samsung Galaxy A40: Charges slowly when turned off, doesn't charge at all when turned on

Fri, 28 Feb 2025 11:37:14 -0700

As the title says. The phone charges slowly when turned off (I know this because after it runs down to zero and shuts off again, if I leave it, it's about 5% charged in an hour). But when I turn it on, it doesn't even recognise that it's plugged in, and quickly runs low again. What's going on with this? I've tried chargers that are 100% confirmed to work in other phones and devices, on various sockets around the house, and nothing helps.

⟐ Answered February 28, 2025 at 11:37 MST

Samsung Galaxy A40: I dropped my samsung phone that fell into the water and now no charge

Tue, 03 Sep 2024 06:56:10 -0700

i dropped my samsung a40 in the toilet :( in 2020 and now in 2023 i found in and i tried to rivive it it seams that he wants to turn on only if he is connect to a charge but when i disconect the charger he dies he also tells me that his tempeture is too low and he is waits to get a normal tempeture so he can charge but he aint charging :(

⟐ Commented September 03, 2024 at 6:56 MST

Samsung Galaxy A40: Screen stuck on Samsung A40 Galaxy logo on screen

Sat, 31 Aug 2024 15:45:10 -0700

Why is it stuck in this mode. Just totally frozen😥😥😰

⟐ Answered August 31, 2024 at 15:45 MST

Samsung Galaxy A40: Is my phone's charging system working?

Mon, 08 Jul 2024 16:59:13 -0700

Hi, so I dropped my samsung phone into the sea in winter and I left it on my drawer for months. Now I tried to fix it, took off the motherboard shields and cleaned the corrosion. After that I replaced the charging board. Now I measured the end of the main flex and it shows 5v. When I measure the battery connector it shows 2.1volts. Is this normal? Should I pay 70 dollars to replace the screen and battery or is it a waste? Please answer, it is a very important phone to me, thank you

@oldturkey03 I cleaned all corrosion tho, even under the sheilds... Could it indicate anything else? Also now that I am checking with my multimeter I check 2.4 volts at the battery connector while charging instead of 2.1 volts. Also heres a photo of the motherboard

Also I got the ammeter, it shows 5volts and 0.00 amps. What should I do? My new battery also reads 2.65 volts with the multimeter, is it normal?

@oldturkey03 here you go:

⟐ Commented July 08, 2024 at 16:59 MST

Samsung Galaxy A40: The black plastic thing is falling off, is it needed for anything?

Tue, 02 Jul 2024 09:52:58 -0700

The black plastic thing which you can see if the picture is falling off, is it needed for anything?

⟐ Answered July 02, 2024 at 9:52 MST

Samsung Galaxy A40: Is my phone's charging system working correctly?

Sat, 29 Jun 2024 09:30:26 -0700

Samsung Galaxy A40: My samsung a40 phone shows no sign of life

Sat, 29 Jun 2024 06:00:15 -0700

Samsung Galaxy A40: Retrieving media from a non-responsive phone

Sat, 08 Jul 2023 05:27:11 -0700

Hello,

My phone fell out of my pocket while I was riding a bike and the screen got seriously damaged to the point it doesn't display totally anything. However it still vibrates when I plug it in to charger so I believe it still could function. I tried to connect the phone to the pc through usb cable to get my gallery recovered but mtp usb driver failed to install (that wasn't the case earlier or with other phone I checked) and the devices didn't connect. Is there some way to get my data back? Any tips are welcome

⟐ Commented July 08, 2023 at 5:27 MST

Samsung Galaxy A40: Why is my phone when I turn it on it seems like I'm going to format it

Sun, 23 Apr 2023 13:50:41 -0700

Why my phone when I turn it on it seems like I'm going to format it?

⟐ Answered April 23, 2023 at 13:50 MST

Samsung Galaxy A40: Shuts off randomly when I still have battery.

Sat, 18 Mar 2023 23:28:02 -0700

Shuts offs randomly when i still got a charge in it.

To start it back up i gotta press hard on the backside where the connection between the board and battery connects.

⟐ Answered March 18, 2023 at 23:28 MST

Samsung Galaxy A40: Device Screen is black and shows no sign of life

Mon, 13 Feb 2023 10:53:55 -0700

One day I was listening to music on the phone when it suddenly started vibrating and died. The screen was black and did not want to turn on again. However when I plug it into my pc and attempt to power it on whilst running lusb (debian Linux) the device comes up as Samsung Electronics Co., Ltd Exynos7885 for about two seconds before disappearing. How can I go about fixing and troubleshooting this?

⟐ Commented February 13, 2023 at 10:53 MST

Samsung Galaxy A40: Why does the flex cable and chargerport keeps getting damaged?

Wed, 01 Feb 2023 22:10:16 -0700

I have an A40 but the charger port or flex keeps getting damaged every time i replace it.It looks like something else is the problem does anyone have any suggestions?

⟐ Commented February 01, 2023 at 22:10 MST

Samsung Galaxy A40: Phone only turns on when I hold under the fingerprint sensor

Wed, 23 Nov 2022 13:21:43 -0700

My phone is only powering on when I press hard under the fingerprint sensor, right on the Samsung logo, if I release it shuts off

Samsung Galaxy A40: Why is my camera not working and my phone is not receiving sim signal

Thu, 29 Sep 2022 12:21:13 -0700

My phone's camera is not focusing, and my phone doesn't have a steady network connection, almost non-existent.

Please, my phone is a Samsung a30

⟐ Commented September 29, 2022 at 12:21 MST

Samsung Galaxy A40: Samsung A40 stopped charging yesterday following him dropping it.

Thu, 02 Jun 2022 08:19:40 -0700

Hi, my brothers Samsung A40 stopped charging yesterday following him dropping it, resulting in the phone being bent. The phone is now completely dead and he has a replacement in the mail. However, he doesn’t want to lose all of his images and contacts. Any suggestions?

Thanks.

⟐ Comment deleted June 02, 2022 at 8:19 MST

Samsung Galaxy A40: Why is my phone shutting off randomly?

Tue, 31 May 2022 05:34:01 -0700

I have a Samsung Galaxy A40 which keeps shutting down randomly, for some minutes after it has shut off it doesnt want to turn back on and if i try to plug it in a charger it just bootloops. I cant also take a picture with flash or it will shut off, what can it be the issue?

also its not a software issue cuz i factory resseted it

⟐ Commented May 31, 2022 at 5:34 MST